SAN - Migrate LVM volumes to new storage
I'm planning to migrate a set of servers to a new SAN. All servers use multipath, with (most) storage in LVM. As far as I can see the strategy should be to hook them up to the new SAN, present new LUNs and do a pvmove to the new disk, and vgreduce/pvremove'ing the old disks.
All servers are RHEL5. Volume sizes range from small to several hundred GB.
Are there any scenarios where I would not be able to run an online pvmove to migrate storage?
As the servers boot from SAN, will this strategy also work for the root vg, or is some other copy (cpio) better for the root and boot file systems?
Thanks for any input on planning for storage migration.
